Medicine: Making Sure About Sex

Though nature endows most people with sexual organs that are distinctly
male or female, every so often it errs. On rare occasions, a child is
born with ambiguous genitalia. In some cases, babies who look outwardly
female also have rudimentary male organsor have testes within their
ovaries (a growth that frequently becomes cancerous). Other infants, at
first appearing to be male, have small testes, are sterile, and later
develop breasts and grow no facial hair.

Fortunately, this gender confusion can usually be corrected with
sex-hormone therapy and delicate...